Virgin Trains are usually ok about letting you sit/stand in the FC vestibule, I've never had a problem with it before.
As for standing for ages, at Christmas I had to stand Leeds-Banbury despite booking a seat as the train was so full I couldn't actually get out of the vestibule and into the carriage!
As for standing for ages, at Christmas I had to stand Leeds-Banbury despite booking a seat as the train was so full I couldn't actually get out of the vestibule and into the carriage!